Bastard, sorry to hear about your experience.
I think that any time one human attempts to exert their will over another's to that person's detriment, it's about power. They may not obviously be thinking 'hey, I'm on a power trip' but that is what they're doing.
To take another example: a teacher wants a pupil to sit down and be quiet. (I'm a teacher, so this isn't a teacher bashing example). They have a certain amount of power over that child because of the teacher/pupil scenario. A bit like men have more power than women, so it's easier to exert their control.
The act of making a child sit quietly is not a bad thing, and can be a good thing (just like sex) but there can be times when it's not the right thing, or the teacher does it in a wrong way, or even when the teacher is doing it just to prove that they have the power to, and they even embarrass the pupil in how they do it. BUT - in many, many of the possible ways that a teacher can make a pupil sit down, the only one which engages the pupil respectfully and includes consent is the teacher saying "would you like to sit down?" and the pupil saying "yes". It is ONLY if the pupil gives consent that it isn't some tacit display of the power differential between teacher and pupil. When the teacher actually engages with the pupil, and asks, and listens to the pupil's response, it isn't about a power play.
That's what we need to teach about consent. Any person who has more power/authority than another, and just carelessly assumes that then can exert it, no matter how much they do so gently, is in a power play situation.